Vlll ADVERTISEMENT. 



'^ Manual of British Alg-ae/' to which it will be 

 found, I trust, a usefal introductory volume. The 

 localities of the rare species (excepting in the in- 

 stances where the finders' names are mentioned) 

 are extracted from the ^' Phycologia Britannica/' 

 another valuable work by Dr. Harvey, containing 

 coloured figures and descriptions of all the British 

 sea- weeds. 



It is gratifying to me to find that my efforts to 

 simplify this study have been approved of by those 

 conversant with the subject, and that the credit 

 has been awarded me '^ of having first led attention 

 in a simple, popular, as well as strictly scientific 

 manner, to an interesting branch of botany pre- 

 viously little studied." This encouraging expres- 

 sion of opinion induces me to suppose that the 

 present improved edition will meet with a cordial 

 reception from those intending to begin the study 

 of our rich and varied Marine Flora. 



I. GIFFORD. 



Parks, Mineheadj April, 1853. 



